jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 6, 2017 18:39:00 GMT -5
Cut these two 100 grit pads that are glued together with a 14 inch abrasive metal cutting saw. 5000 RPM beast, cuts railroad track in half. Well, these pads glazed the saw blade in short order. It took a lot of effort to cut these. I had to cut metal 4 times to shear off new grit(like dressing a saw or grinder). Rounded edge after 24 hours in a rotary at 55 RPM with a fresh charge of SiC 30 grit. Before: After, note rounded edge: These are cheap $1.60 pads. Counting diamonds here. Looks like 12-100 grit diamonds on one 3/16" X 3/16" block. Maybe expensive pads have a higher diamond density. Don't think it matters. They may all have 30 carats per pad. The tumbling did a major change in exposing the diamonds in the virgin pad. And did not seem to knock any diamonds out due to impact at a fast 55 RPM. Important. The diamonds are so sharp that they scratched this agate easily with the weight of this stone. It is the size of 4 quarters stacked on each other. This is critical. Cutting rock with very little pressure.
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Wooferhound
Cave Dweller
Lortone QT66 and 3A
Member since December 2016
Posts: 1,432
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Post by Wooferhound on Feb 6, 2017 19:08:27 GMT -5
Can't you just break it up into chunks with a pair of Pliers ?
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 6, 2017 19:13:45 GMT -5
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 6, 2017 19:16:35 GMT -5
Can't you just break it up into chunks with a pair of Pliers ? You can cut them up with scissors BEFORE glueing them together. The canvas backing is really tough and glued on with super strong bond. Hard to break. The plastic matrix is super tough too. ETA Use old scissors. The diamonds shredded the blades.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 6, 2017 19:30:56 GMT -5
The tumbler cleans them up nicely. Guessing they will last a long time with out adding SiC 30. They are not going to get dull. I tried dulling them by rubbing a round agate on them 100+ strokes with as much pressure as I could push down. Damn diamonds as sharp as they were before.
To break them in you are probably going to have to run them with SiC for a day. They are in molded plastic and the diamonds are not protruding when they are brand new.
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Post by MrMike on Feb 6, 2017 19:45:31 GMT -5
The tumbler cleans them up nicely. Guessing they will last a long time with out adding SiC 30. They are not going to get dull. I tried dulling them by rubbing a round agate on them 100+ strokes with as much pressure as I could push down. Damn diamonds as sharp as they were before. To break them in you are probably going to have to run them with SiC for a day. They are in molded plastic and the diamonds are not protruding when they are brand new. Talk about a game changer if this works, be careful though, SiC suppliers might want you to meet Jimmy Hoffa....
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Post by Garage Rocker on Feb 6, 2017 19:51:11 GMT -5
Watching.
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Post by wigglinrocks on Feb 6, 2017 20:13:55 GMT -5
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Post by orrum on Feb 6, 2017 20:53:10 GMT -5
X3
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 7, 2017 5:28:53 GMT -5
May have something that stays 10-30-50 or whatever your preference. Without renewing, and stays dead sharp for needed low pressure cutting. Never had full time full sized grit. I have a diamond pad 'grind to polish slabs' machine that uses 100-200-400-800-1500-3000 pads. I epoxied the pads on 3600 RPM grinder face plates about 10 years ago. Never came close to wearing the pads out grinding saw marks of and laying down a polish on hundreds of slabs and sawn specimens. Original 100 grit pad-still good after 10 years.(edge got crashed when face grinding saw marks on 10-20 pound coral specimens) Also used to saw and polish railroad track anvils for silversmith's at Amalgam arts Jewelry School students with this machine. The same 100 grit pad in above photo. anvil ready for 200 grit. Finished anvil looks a mirror. Pads sharpen hard knife blades with no effort. Go 100-200-400-800 and yo knife will shave hair.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 7, 2017 5:59:39 GMT -5
Maybe a tile saw blade will cut them easier. diamond vs diamond.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 7, 2017 6:10:34 GMT -5
I believe these pads are 10mm thick instead of 3mm thick. More expensive, looks like $8 instead of $1.60. (Not shopped)Sure they can be found cheaper. It could easily be scissored into 12 'chunks'. More of a chunky sized shape. No idea if chunks are better than flatter pieces.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,555
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Post by jamesp on Feb 7, 2017 6:23:24 GMT -5
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